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+.\" Copyright (c) 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)acosh.3	5.2 (Berkeley) 5/6/91
+.\"	$Id: acosh.3,v 1.4 1993/10/29 22:57:20 jtc Exp $
+.\"
+.Dd May 6, 1991
+.Dt ACOSH 3
+.Os BSD 4.3
+.Sh NAME
+.Nm acosh
+.Nd inverse hyperbolic cosine function
+.Sh SYNOPSIS
+.Fd #include <math.h>
+.Ft double
+.Fn acosh "double x"
+.Sh DESCRIPTION
+The
+.Fn acosh
+function computes the inverse hyperbolic cosine
+of the real
+argument
+.Ar x .
+For a discussion of error due to roundoff, see
+.Xr math 3 .
+.Sh RETURN VALUES
+The
+.Fn acosh
+function
+returns the inverse hyperbolic cosine of
+.Ar x .
+On the
+.Tn VAX
+and
+.Tn Tahoe ,
+if the argument is less than one
+.Fn acosh
+sets the global variable
+.Va errno
+to
+.Er EDOM
+and
+causes a reserved operand fault.
+.Sh SEE ALSO
+.Xr asinh 3 ,
+.Xr atanh 3 ,
+.Xr exp 3 ,
+.Xr infnan 3 ,
+.Xr math 3
+.Sh HISTORY
+The
+.Fn acosh
+function appeared in 
+.Bx 4.3 .